138 The Americayi Geologist. Foi)ruar.v, 1S97 
eurrence of the glauconite in the Swedish Caiubro-Silurian layers is in 
complete accordance with the bathymetric diffusion of sediment rich 
in glauconite in modern seas. In the littoral and sub-littoral zones (of 
the sea) glauconite has never been found. Recent sediments rich in 
glauconite and phosphate of lime have an exact bathymetric equiva- 
lent in the above described shallow -water formations rich in glauconite 
and often phosphate bearing, of the Cambrian and Silurian terrains. 
Herr Andersson draws a distinction between the shore deposits poor 
in glauconite and the shallow sea formation rich in glauconite; both 
types have a great extension at various horizons, Vjoth in the Cambrian 
and the older Lower Silurian; the younger Lower Silurian is formed of 
fine sediments, slates and limestones in which glauconite and phos- 
phate of lime play no important part. 
The shells of the inarticulate brachiopod, which occur in more or less 
abundance in the Lower Cambrian sandstones, are looked upon as the 
source of the phosphate of lime in the nodules found in the older Palae- 
ozoic rocks of Sweden. G. F. M. 
The distribution of the Camhrian and Lower Silurian fornialions in 
Siberia, by Baron Toll, (Memoirs of the Russian Imperial Mineralog- 
ical Society vol. xxxiii, I, 1895.) It was Th. Schmidt who first an- 
nounced the existence of Cambrian beds in Siberia. This well known 
scientist in the year 1886 described three species of trilobites [Agnostus 
czekanoivsJcii, Liostracas maydelli and Anomoeare pavlou-Hkii^ which 
are found in the basin of Olenck in the lower course of Koika and on 
the Vilni river. We have no later information upon the stratigraphy 
and distribution of these deposits in Siberia. 
Very recently Mr. Baron Toll, who studied the collections of Midden - 
dorf Czekanowski and Lopatin, the well known travelers in Siberia, 
concludes, that the Lower Silurian and Cambrian beds have a very 
large development in this country. 
The author shows that the well known but previously not clearly de- 
termined ''red rocks" of Lena are to be referred to the Silurian. In 
Krivolutzki (on the Lena river) occur undoubted Lower Silurian beds 
containing Asaj;)/iMs, Phacojjs, Beyrichia, Primitia, etc., and extending 
westward to the Middle and Lower Toongooeka. This horizon consists 
generally of sandstone, breccia and limestone, and in the upper beds 
often contains gypsum. The dip of the strata is southwestward. 
To the northeast from this place, in the neighborhood of Olekminsk, 
(on the Lena river), Mr. Czekanowski has found the beds which under- 
lie the "red rocks" of Lena. These beds are represented by reddish 
Vn'own limestone and contain Obolella (sp). and several forms of Micro- 
discus, which manifest the near relationship with the Microdiscus 
speciosus and M. lobatus Wale, described as the Lower Cambrian 
forms of America. 
According to Mr. Baron Toll, these Cambrian beds occur over a large 
area; they stretch to the Tabaginsk station (near Takutsk on the Lena 
river) and, probably, to the Olenek river, where the stylolite limestone 
